Aooing-machine



(No Model.) 3 Sheets-Sheet 1.

G. B. P. LINCOLN.

ADDING MACHINE.

No. 390,788. Patented Oct. 9, 1888.

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BY van/m1 2 ATTORNEYS.

(No-Model.) 3 Sheets-Sheet 2. O. B. P. LINCOLN.

ADDING MACHINE. No.'390,788. Patented Oct. 9. 1888.

$288118 i INVENTOR I /M. fififiM 4% BY Axum" ATTORNEYS.

(No Model.)

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G. B. F. LINCOLN.

ADDING MACHINE.

Patented Oct. 9, 1888.

INVENTOR JAM/w WITNESSES ATTORNEYS.

UNITED STATES PATENT Erica.

CHARLES E. F. LINCOLN, OF SAN FRANCISCO, CALIFORNIA.

ADDING=MACHBNE.

SPECIFICATION forming part of Letters Patent No. 390,788, dated Qctcber 9, 1888.

.To model.)

To aZZ whom it may concern:

Be it known that I, CHARLES E. F. LINCOLN, of San Francisco, in the county of San Francisco and State of California, have invented a certain new and useful Improvement in AddingWIachinesofwhich the following is a specifieation.

The object of my improvementis to provide an adding machine whereby greater simplicity, convenience in use, and rapidity in operation are obtainable than usual.

I will first describe in detail an adding-ma chine embodying my improvement and then point out the various features of the said improvement in the claim.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a vertical section of an adding machine embodying my improvement on the line :0 a", Fig. 8. Fig. 2 is an enlarged vertt cal section of the upper portion of the said adding-machine on the line 9 y, Fig. 3. Fig. 3 isa plan view of the said machine, parts being broken out to reveal the internal structure. Fig. 4 is a plan view of the same complete. Fig. 5 is a front view of the same.

In a case,A, are mounted to turn independ cntly of each other a series of (ten here shown) number-wheels, B, having a common axis extending transversely of the case. Each number-wheel B has on its periphery the ten numerals from 0 to 9,repeated (in this case eight times) in succession, and adapted to register singly with one of a transverse row of transparent openings, C, in the front of the case. Each wheel 13 has attached thereto on its righthand side a ratchet-wheel,D, having teeth exactly corresponding in number and position with the numerals on the periphery of the wheel, of which there are in this case eighty. Each ratchet-wheel D is dogged by a springpawl, E, and is engaged by a spring-actuated ratchet-bar, F, pivoted to an upright lever,G, which is guided at its upper end in afixed bearing,I-I,and is pivoted at its lower end to a key-lever, I. This ratchet-bar F has its teeth pitched to pass the teeth of the ratchet-wheel D when forced downward, and is thrown into engagement with said ratchet-wheel by means of a spring bearing on its rear side.

Each key-lever I is pivoted at its rear end to swing vertically onto a fixed support, J, and is normally pressed upward by a spring, K, against a lower key-board, L, beneath which its forward end extends.

Directly over each of the (in the present case ten) key-levers I is arranged a longitudinal row of headed keys, M, mounted to slide vertically in guide-holes in the lower key-board, L, and corresponding guideholes in a similar upper key-board,N, and their lower ends bearing upon the said key-lever.

The keys M of each longitudinal row are numbered from 1 to 9, consecutively, begin.- ning at the front key, and the length and position of each key is so adjusted that the keylever being in its normal position when said key is depressed by the finger until its head comes in contact with the upper key-board it will have, through the connections described, drawn the yielding ratchet-bar F downward over a number of teeth on the ratchet-wheel D corresponding to the number on said key. Then when the key is released the spring K, acting on the corresponding key-lever, will force the ratchet-bar F upward to its normal position and thereby revolve the ratchet-wheel through the distance of a like number of teeth. The number on the key depressed will thus be brought to the aperture C, the corresponding number-wheel B,anda key on the first,second, third,&c., longitudinal row from the right being depressed according as such number denotes units, tens, hundreds, &c., and the proper signification of the number will be given by the distance ofthe opening C at which it is presented from the right of the row of openings. Springs M, acting on the keys between the key-boards L and N,hold them in their normal position independently of the key-lever.

To the left-hand side of each number-wheel B is fixed a carrying-wheel, 0, having a number of peripheral cam-teeth,l?,one for and corresponding with each numeral 10 on the number-wheel. The inclined backs of the camteeth I? on each number-wheel are arranged to engageinsuecession a eorrespondiugly-beveled head, Q, formed on the upper end of a camlever, Q, which is pressed by a spring, R, against the carrying-wheel, and is pivoted at or near its center to a fixed support, S; The lower end of the cam-lever Q is pivoted to the shank of a longitudinallymovable pawl, T, which shank has a lateral offset, T, and is pressed upward by a spring, T, to bring and hold the head of the pawl in engagement with the ratchet-wheel D on the next adjacent numberwheel B of higher denomination. Each cam-tooth P of the carrying-wheel, when it comes into action with the cam lever Q, is arranged to swing said cam-lever so as to throw the pawl T, and thus the adjacent ratchetwheel D with which it engages, forward the distance of one tooth. Thus as 0, indicating ten, is brought to an aperture 0 by each number-wheel one is carried to the number-wheel of next higher denomination,and the numeral 1 is Visible on the first-mentioned wheel, and so on until the highest number, 9, on the extreme left-hand wheel is reached.

Longitudinal partitions I may be provided, if desired,to separate the keys M, correspondingto hundreds, thousands, &c.

It will generally be found desirable to journal a long crank, 1, transversely in the ease below the series of key-levers Lsaid crank hav- V ing asquared end, 1", (see Fig. 3,) projecting through one side of the case for reception of a key, by which the crank may be turned, as indicated in dotted lines in Fig. 1, to look all the key-levers, and hence the adding mechanism, against accidental or intentionai displacement.

Having thus described my invention,l claim as new and desire to secure by Letters Patent- The combination, with the casing A,having a key-board and sight-apertures O, the series of number-wheels B, registering with said apertures and each having series of numerals 0 to 9 on its periphery, a projection or tooth, P, on one side in line with the O of each series, and a ratchctwheel, D, having teeth corresponding in number and position with the numerals on the periphery thereofiof the springpressed levers I, pivoted below the wheels B and extending under thekey-board, the rackbars carried by said levers and engaging the ratchet-wheels D, substantially as described, the series of nine keys M for each lever I, and

each series numbered from 1 to 9, begi nnin g with the outer key, these numbers indicating the numberofteeth that the number-wheels will be turned when the keys are depressed to actuate the levers I, and the pivoted springpressed cam-levers Q, having beveled heads Q at their upper ends acted upon by the projections or teeth I? of one wheel, B, and pawls T, pivoted to the lower ends of the levers Q, provided with a spring, T and engaging the ratchetwheel I) of the next wheel B to the left.

CHARLES B. F. LINCOLN. \Vitnesses:

S. H. PERKINS, XVILLIAM T. BRYAN. 

